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4.1 Mode Parameters
C141-E167 4 - 17
• HSEC (hard sectoring)
When this bit is "1," it indicates that the data formatting method on the disk media is "hard
sectoring." However, since the IDD uses only the "hard sectoring" method, this bit is
disregarded. Furthermore, it is impossible to change this parameter.
• RMB (removable medium)
When this bit is "1," it indicates that the storage media of the disk drive can be replaced.
When this bit is "0," it indicates that the storage media is fixed. However, since the IDD
has a fixed media, this bit is disregarded. Furthermore, it is impossible to change this
parameter.
• SURF (surface addressing)
When this bit is "1," it indicates that after logical data block address allocation is performed
over all the sectors in order on the same memory surface (same head), it is proceeding to
the next memory surface (next head) after all the sectors have been done. When this bit is
"0," it indicates that after logical data block address allocation is performed over all the
sectors in order in the same cylinder (all heads), it is proceeding to the next cylinder. In the
IDD, only the latter type of addressing is possible, so this bit is disregarded. It is also
impossible to change this parameter.
4.1.4 Drive parameter (page code = 4)
The page descriptor format of this MODE SELECT parameter is shown in Figure 4.4.